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open-commit-sig: create signature for commit tx.

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Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell
2015-05-30 20:11:10 +09:30
parent 63986e5b2d
commit bf38ca052e
14 changed files with 313 additions and 36 deletions
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108
open-commit-sig.c Normal file
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/* My example:
* ./open-commit-sig A-open.pb B-open.pb cUBCjrdJu8tfvM7FT8So6aqs6G6bZS1Cax6Rc9rFzYL6nYG4XNEC A-leak-anchor-sigs.pb B-leak-anchor-sigs.pb > A-commit-sig.pb
* ./open-commit-sig B-open.pb A-open.pb cQXhbUnNRsFcdzTQwjbCrud5yVskHTEas7tZPUWoJYNk5htGQrpi B-leak-anchor-sigs.pb A-leak-anchor-sigs.pb > B-commit-sig.pb
*/
#include <ccan/crypto/shachain/shachain.h>
#include <ccan/short_types/short_types.h>
#include <ccan/tal/tal.h>
#include <ccan/opt/opt.h>
#include <ccan/str/hex/hex.h>
#include <ccan/err/err.h>
#include <ccan/read_write_all/read_write_all.h>
#include "lightning.pb-c.h"
#include "anchor.h"
#include "base58.h"
#include "pkt.h"
#include "bitcoin_script.h"
#include "permute_tx.h"
#include "signature.h"
#include <openssl/ec.h>
#include <unistd.h>
int main(int argc, char *argv[])
{
const tal_t *ctx = tal_arr(NULL, char, 0);
OpenChannel *o1, *o2;
struct bitcoin_tx *anchor, *commit;
struct sha256_double txid;
struct pkt *pkt;
u8 *redeemscript, *sig;
size_t *inmap, *outmap;
EC_KEY *privkey;
bool testnet;
struct bitcoin_compressed_pubkey pubkey;
err_set_progname(argv[0]);
opt_register_noarg("--help|-h", opt_usage_and_exit,
"<open-channel-file1> <open-channel-file2> <commit-privkey> <leak-anchor-sigs1> <leak-anchor-sigs2>\n"
"Create the signature needed for the commit transaction",
"Print this message.");
opt_parse(&argc, argv, opt_log_stderr_exit);
if (argc != 6)
opt_usage_and_exit(NULL);
o1 = pkt_from_file(argv[1], PKT__PKT_OPEN)->open;
o2 = pkt_from_file(argv[2], PKT__PKT_OPEN)->open;
privkey = key_from_base58(argv[3], strlen(argv[3]), &testnet, &pubkey);
if (!privkey)
errx(1, "Invalid private key '%s'", argv[3]);
if (!testnet)
errx(1, "Private key '%s' not on testnet!", argv[3]);
/* Create merged anchor transaction */
anchor = anchor_tx_create(ctx, o1, o2, &inmap, &outmap);
if (!anchor)
errx(1, "Failed transaction merge");
/* Get the transaction ID of the anchor. */
anchor_txid(anchor, argv[4], argv[5], inmap, &txid);
/* Now create commitment tx: one input, two outputs. */
commit = bitcoin_tx(ctx, 1, 2);
/* Our input spends the anchor tx output. */
commit->input[0].txid = txid;
commit->input[0].index = outmap[0];
/* First output is a P2SH to a complex redeem script */
redeemscript = bitcoin_redeem_revocable(ctx, o1->anchor->pubkey,
o1->locktime_seconds,
o2->anchor->pubkey,
o1->revocation_hash);
commit->output[0].script = scriptpubkey_p2sh(ctx, redeemscript);
commit->output[0].script_length = tal_count(commit->output[0].script);
if (o1->anchor->total < o1->commitment_fee)
errx(1, "Our contribution to channel %llu < fee %llu",
(long long)o1->anchor->total,
(long long)o1->commitment_fee);
commit->output[0].amount = o1->anchor->total - o1->commitment_fee;
/* Second output is a simple payment to them. */
commit->output[1].script = o2->script_to_me.data;
commit->output[1].script_length = o2->script_to_me.len;
if (o2->anchor->total < o2->commitment_fee)
errx(1, "Their contribution to channel %llu < fee %llu",
(long long)o2->anchor->total,
(long long)o2->commitment_fee);
commit->output[1].amount = o2->anchor->total - o2->commitment_fee;
permute_outputs(o1->seed, o2->seed, 1, commit->output, 2, NULL);
sig = sign_tx_input(ctx, commit, 0, anchor->output[outmap[0]].script,
anchor->output[outmap[0]].script_length, privkey);
pkt = open_commit_sig_pkt(ctx, sig, tal_count(sig));
if (!write_all(STDOUT_FILENO, pkt,
sizeof(pkt->len) + le32_to_cpu(pkt->len)))
err(1, "Writing out packet");
tal_free(ctx);
return 0;
}